Question

Simplify, (xy+yz)² - 2x²y²z² and find the value when x=-1, y=2 and z=1

Answer 1

Answer:

a)x²y²+2xy²z+y²z²-2x²y²z²

b) -8

Step-by-step explanation:

foil the squared to get:x²y²+2xy²z+y²z²

and then plug in the numbers and chug along

hope this helps

Answer 2

Simplify:

We have

• (xy + yz)² - 2x²y²z

If,

• x = -1, y = 2 and z = 1

Putting value:

• (xy + yz)² - 2x²y²z

➡ (-1×2 + 2×1)² - 2×-1²×2²×1

➡ (-2 + 2)² - 2×1×4×1

➡ (0)² - 8

➡ 0 - 8 = -8,answer